[Bug 1903814] Re: [binutils] Prevent GOT access rewrite for certain symbols

Thu Feb 18 09:18:06 UTC 2021

** Description changed:

  [Impact]

-  * In s390 kernel context, this bug manifests itself as random errors
+  * In s390 kernel context, this bug manifests itself as random errors
  and infinite loops.

  [Test Case]

-  * Needs to be confirmed by IBM
-  * Build-time tests-suite (applied upstream) backported to Bionic in
-    + ld/testsuite/ld-s390/gotreloc-1.s
-    + ld/testsuite/ld-s390/gotreloc-1.ver
-    + ld/testsuite/ld-s390/gotreloc_31-1.dd
-    + ld/testuite/ld-s390/gotreloc_64-1.dd
+  * Needs to be confirmed by IBM
+  * Build-time tests-suite (applied upstream) backported to Bionic in
+    + ld/testsuite/ld-s390/gotreloc-1.s
+    + ld/testsuite/ld-s390/gotreloc-1.ver
+    + ld/testsuite/ld-s390/gotreloc_31-1.dd
+    + ld/testuite/ld-s390/gotreloc_64-1.dd
+  * If you build the kernel with CONFIG_DEBUG_INFO_BTF, there is a 50% chance that you will see "Failed verification: in-kernel BTF is malformed" during boot

  [Where problems could occur]

-  * Binutils is a base toolchain package
-    - A problem could potentially affect the whole system
-    - With compiler/linker errors
-    - Or random errors in the produced binaries
-  * This patch touches only architecture specific code in bfd/elf64-s390.c
-    - It would only affect the s390x architecture in this case
+  * Binutils is a base toolchain package
+    - A problem could potentially affect the whole system
+    - With compiler/linker errors
+    - Or random errors in the produced binaries
+  * This patch touches only architecture specific code in bfd/elf64-s390.c
+    - It would only affect the s390x architecture in this case

  [Other Info]
-  
-  * While testing the fix in Bileto, we found one pending autopkgtest regression with linux/amd64 4.15.0-135.139 which is resolved in 4.15.0-136.140 (currently in -proposed).

+  * While testing the fix in Bileto, we found one pending autopkgtest
+ regression with linux/amd64 4.15.0-135.139 which is resolved in
+ 4.15.0-136.140 (currently in -proposed).

  == Original Description ==
  Please backport the following bugfix into Ubuntu LTS: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=e6213e09ed0e

  Some relevant historic links:
  Debian bugreport: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=961736
  glibc bugreport: https://sourceware.org/bugzilla/show_bug.cgi?id=18960

  In s390 kernel context, this bug manifests itself as random errors and
  infinite loops, so it's fairly severe.

  These are the current versions of binutils:
  Package binutils

      xenial (16.04LTS) (devel): GNU assembler, linker and binary utilities
      2.26.1-1ubuntu1~16.04.8 [security]: amd64 i386
      2.26-8ubuntu2 [ports]: arm64 armhf powerpc ppc64el s390x
      xenial-updates (devel): GNU assembler, linker and binary utilities
      2.26.1-1ubuntu1~16.04.8: amd64 arm64 armhf i386 powerpc ppc64el s390x
      bionic (18.04LTS) (devel): GNU assembler, linker and binary utilities
      2.30-21ubuntu1~18.04.4 [security]: amd64 i386
      2.30-15ubuntu1 [ports]: arm64 armhf ppc64el s390x
      bionic-updates (devel): GNU assembler, linker and binary utilities
      2.30-21ubuntu1~18.04.4: amd64 arm64 armhf i386 ppc64el s390x
      focal (20.04LTS) (devel): GNU assembler, linker and binary utilities
      2.34-6ubuntu1: amd64 arm64 armhf i386 ppc64el s390x
      groovy (devel): GNU assembler, linker and binary utilities
      2.35.1-1ubuntu1: amd64 arm64 armhf i386 ppc64el s390x

  The patch applies fine to 2.26 and 2.30 (except for tests, but we don't
  need them). We don't need it on 2.32+.

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https://bugs.launchpad.net/bugs/1903814

Title:
  [binutils] Prevent GOT access rewrite for certain symbols

Status in Ubuntu on IBM z Systems:
  Triaged
Status in binutils package in Ubuntu:
  Fix Released
Status in binutils source package in Bionic:
  New
Status in binutils package in Debian:
  New

Bug description:
  [Impact]

   * In s390 kernel context, this bug manifests itself as random errors
  and infinite loops.

  [Test Case]

   * Needs to be confirmed by IBM
   * Build-time tests-suite (applied upstream) backported to Bionic in
     + ld/testsuite/ld-s390/gotreloc-1.s
     + ld/testsuite/ld-s390/gotreloc-1.ver
     + ld/testsuite/ld-s390/gotreloc_31-1.dd
     + ld/testuite/ld-s390/gotreloc_64-1.dd
   * If you build the kernel with CONFIG_DEBUG_INFO_BTF, there is a 50% chance that you will see "Failed verification: in-kernel BTF is malformed" during boot

  [Where problems could occur]

   * Binutils is a base toolchain package
     - A problem could potentially affect the whole system
     - With compiler/linker errors
     - Or random errors in the produced binaries
   * This patch touches only architecture specific code in bfd/elf64-s390.c
     - It would only affect the s390x architecture in this case

  [Other Info]

   * While testing the fix in Bileto, we found one pending autopkgtest
  regression with linux/amd64 4.15.0-135.139 which is resolved in
  4.15.0-136.140 (currently in -proposed).

  == Original Description ==
  Please backport the following bugfix into Ubuntu LTS: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=e6213e09ed0e

  Some relevant historic links:
  Debian bugreport: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=961736
  glibc bugreport: https://sourceware.org/bugzilla/show_bug.cgi?id=18960

  In s390 kernel context, this bug manifests itself as random errors and
  infinite loops, so it's fairly severe.

  These are the current versions of binutils:
  Package binutils

      xenial (16.04LTS) (devel): GNU assembler, linker and binary utilities
      2.26.1-1ubuntu1~16.04.8 [security]: amd64 i386
      2.26-8ubuntu2 [ports]: arm64 armhf powerpc ppc64el s390x
      xenial-updates (devel): GNU assembler, linker and binary utilities
      2.26.1-1ubuntu1~16.04.8: amd64 arm64 armhf i386 powerpc ppc64el s390x
      bionic (18.04LTS) (devel): GNU assembler, linker and binary utilities
      2.30-21ubuntu1~18.04.4 [security]: amd64 i386
      2.30-15ubuntu1 [ports]: arm64 armhf ppc64el s390x
      bionic-updates (devel): GNU assembler, linker and binary utilities
      2.30-21ubuntu1~18.04.4: amd64 arm64 armhf i386 ppc64el s390x
      focal (20.04LTS) (devel): GNU assembler, linker and binary utilities
      2.34-6ubuntu1: amd64 arm64 armhf i386 ppc64el s390x
      groovy (devel): GNU assembler, linker and binary utilities
      2.35.1-1ubuntu1: amd64 arm64 armhf i386 ppc64el s390x

  The patch applies fine to 2.26 and 2.30 (except for tests, but we
  don't need them). We don't need it on 2.32+.

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